DESCRIPTION
fence_kdump is an I/O fencing agent to be used with the kdump crash recovery service. When the fence_kdump agent is invoked, it will listen for a message from the failed node that acknowledges that the failed node it executing the kdump crash kernel. Note that fence_kdump is not a replacement for traditional fencing methods. The fence_kdump agent can only detect that a node has entered the kdump crash recovery service. This allows the kdump crash recovery service complete without being preempted by traditional power fencing methods.
Note: the "off" action listen for message from failed node that acknowledges node has entered kdump crash recovery service. If a valid message is received from the failed node, the node is considered to be fenced and the agent returns success. Failure to receive a valid message from the failed node in the given timeout period results in fencing failure.
fence_kdump accepts options on the command line as well as from stdin. Fenced sends parameters through stdin when it execs the agent. fence_kdump can be run by itself with command line options. This is useful for testing and for turning outlets on or off from scripts.
Vendor URL: http://www.kernel.org/pub/linux/utils/kernel/kexec/
PARAMETERS
- -n, --nodename=NODE
-
Name or IP address of node to be fenced. This option is required for the "off" action.
- -p, --ipport=PORT
-
IP port number that the fence_kdump agent will use to listen for messages. (Default Value: 7410)
- -f, --family=FAMILY
-
IP network family. Force the fence_kdump agent to use a specific family. The value for FAMILY can be "auto", "ipv4", or "ipv6". (Default Value: auto)
- -o, --action=ACTION
-
Fencing action to perform. The value for ACTION can be either "off" or "metadata". (Default Value: off)
- -t, --timeout=TIMEOUT
-
Number of seconds to wait for message from failed node. If no message is received within TIMEOUT seconds, the fence_kdump agent returns failure. (Default Value: 60)
- -v, --verbose
-
Print verbose output
- -V, --version
-
Print version
- -h, --help
-
Print usage
ACTIONS
- off
-
Power off machine.
- monitor
-
Check the health of fence device
- metadata
-
Display the XML metadata describing this resource.
STDIN PARAMETERS
- nodename
-
Name or IP address of node to be fenced. This option is required for the "off" action.
- ipport
-
IP port number that the fence_kdump agent will use to listen for messages. (Default Value: 7410)
- family
-
IP network family. Force the fence_kdump agent to use a specific family. The value for FAMILY can be "auto", "ipv4", or "ipv6". (Default Value: auto)
- action
-
Fencing action to perform. The value for ACTION can be either "off" or "metadata". (Default Value: off)
- timeout
-
Number of seconds to wait for message from failed node. If no message is received within TIMEOUT seconds, the fence_kdump agent returns failure. (Default Value: 60)
- verbose
-
Print verbose output
- version
-
Print version
- usage
-
Print usage